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问题 单项选择题

Recharging a previously used cartridge-operated dry-chemical extinguisher is accomplished by（）.

A.authorized fire equipment servicing personnel only

B.replacing the propellent cartridge and refilling with powder

C.puncturing the cartridge seal after installation

D.recharging the cartridge and refilling it with powder

答案

参考答案：B

阅读理解

请根据材料内容，完成各题。

I study in Hongqing Middle School. The school is big and clean .There are 24 classes, 100 teachers and 800 students in it. There are two buildings in our school. (1)Our classrooms and teachers’ offices are in the buildings. There is a （2）__________ and a reading _______ in it. We often borrow (借)and read books there. I like my school very much. Welcome to our school.

请阅读短文，按要求完成下面的练习。

小题1:将（1）句译成中文：

________________________________________

小题2:在（2）句的空白处填入适当的词使句意完整、上下文通顺。（每空一词）

_________    __________

小题3:回答问题：How many people are there in the school? ________________________________________________________

小题4:找出与Our school has two buildings意思相近的句子。

___________________________________________________

小题5:从文中选出能表达该主题的句子。

______________________________________________________
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选择题

下列物质中，属于电解质的是

A．CO2

B．石墨

C．K2SO4

D．NaOH溶液
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